CN111414024A - Coordinated furnace changing method for gas pipe network of blast furnace hot blast stove - Google Patents
Coordinated furnace changing method for gas pipe network of blast furnace hot blast stove Download PDFInfo
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- CN111414024A CN111414024A CN202010151598.XA CN202010151598A CN111414024A CN 111414024 A CN111414024 A CN 111414024A CN 202010151598 A CN202010151598 A CN 202010151598A CN 111414024 A CN111414024 A CN 111414024A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
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Abstract
The invention relates to the technical field of coordination control of furnace changing time of blast furnace hot blast furnaces, and discloses a method for coordinating furnace changing time among blast furnace hot blast furnaces based on prediction of furnace burning state and future state of the blast furnace hot blast furnaces. The method comprises the steps of establishing an optical fiber physical link between a server and the blast furnace hot blast stove, collecting operation parameter data of each blast furnace hot blast stove, judging the operation state of each blast furnace hot blast stove in real time, predicting the stove change time of each blast furnace hot blast stove according to the stove burning state of each hot blast stove in the middle stage of stove burning, correcting the strength of the blast furnace hot blast stove in advance according to the prediction result, and adjusting the stove change time of each hot blast stove in an adjustable interval of waste gas temperature according to the stove burning and stove change conditions of each blast furnace hot blast stove in the final stage of stove burning. The method realizes the coordination of furnace change among a plurality of hot blast furnaces by advanced change of the furnace burning strength in the middle period and accurate control of the furnace change time in the last period, avoids overlapping furnace change to the maximum extent, reduces the pressure fluctuation of a gas pipe network, and lays a foundation for the balance control of the pipe network.
Description
Technical Field
The invention relates to the field of coordination control of metallurgical blast furnace hot blast stove gas pipe networks, in particular to a coordination furnace changing method of blast furnace hot blast stove gas pipe networks.
Background
In the metallurgical industry, the hot blast stove is one of main matched equipment of blast furnaces in iron works, and is used for continuously providing high-temperature hot air with the temperature of more than 1000 ℃ for the blast furnaces, and each blast furnace is matched with 3-4 hot blast stoves, and an air supply system of one burning and one feeding, two burning and one feeding, one burning and two feeding, cross parallel connection and the like is adopted. The blast furnace hot blast stove in the metallurgical industry is one of main users of blast furnace gas, the amount of blast furnace gas used by the blast furnace hot blast stove in each ferrous metallurgy plant accounts for 30-60% of the total gas production amount of the blast furnace, and because the production high-temperature air volume process of the hot blast stove belongs to a periodic heat storage and heat release process, the furnace change operation of the hot blast stove from combustion to air supply or from air supply to combustion in each time can cause larger impact on the pressure of the whole pipe network, and the blast furnace hot blast stove is one of main reasons for unstable pressure of the blast furnace gas pipe network, and too large pressure fluctuation.
At present, the mode of managing the gas pipe network of the hot blast furnace generally adopts manual command operation, the current states of all blast furnace hot blast furnace operation chambers are communicated through telephone calls, whether a coordination center has furnace changing conditions or not is inquired during furnace changing, the whole coordination furnace changing process is judged and completed manually, and furnace changing operation is not prospective. The most serious problems of the treatment mode are that the condition of the blast furnace is uncertain, and the labor management cost and the communication are not timely.
In conclusion, based on the current situation, a coordinated furnace changing method with automatic instruction coordination and real-time furnace burning state sharing is developed.
Disclosure of Invention
In view of the above problems, the present invention provides a method for coordinating the time for changing blast furnace hot blast stoves based on the status of the blast furnace hot blast stoves and the prediction of future status.
The invention adopts the following technical scheme for solving the technical problems:
under the condition of ensuring the coordination of furnace replacement as far as possible without influencing normal single furnace burning, the overlapping furnace replacement time is reduced to the maximum extent, the quantity of on-grid equipment is kept stable, and the pressure fluctuation of a gas pipe network caused by large fluctuation of the amount of used coal gas in a blast furnace hot blast stove is relieved.
In order to achieve the purpose, a standard operation standard is found, if the air supply system is the same (the same is two times of combustion and one time of delivery or the same is one time of combustion and two times of delivery), reasonable basic furnace burning standards are formulated, such as fixed furnace burning time, waste gas temperature, air supply time and furnace changing time (which are not required to be all satisfied); if the air supply systems are different (one burning one sending, two burning one sending, one burning two sending, cross parallel connection and the like), a single hot blast stove which is inconvenient to modify or has a more standard burning air supply mode is selected as the peak load shifting standard. Except that the standard hot blast stove is operated according to the standard specification, the other hot blast stoves are subjected to peak staggering operation according to the following steps.
The first step is as follows: and (4) communication detection, namely detecting whether the heartbeat data transmitted from the single hot blast stove is normal or not, executing the next step if the heartbeat data is normal, wherein in the communication monitoring process, the communication abnormality phenomenon of any blast furnace hot blast stove is regarded as communication abnormality, and jumping out of circulation.
The second step is that: data acquisition, basic data calculation and pretreatment: reading basic data information of each blast furnace hot blast stove to a database, wherein the basic data information comprises vault crown temperature, actual waste gas temperature, set waste gas temperature, hot blast stove state, stove burning time, air supply state, waste gas temperature rise and the like, calculating current equipment constants, actually counting the number of blast furnace hot blast stove equipment on the network, making a decision to judge whether the number of coal gas equipment used by the pipe network at the moment meets design expectations or not, and the like, and further guiding the next operation.
The third step: and adjusting the middle period, wherein the furnace burning can be carried out according to the normal furnace burning rhythm in the early period of the furnace burning, when the target value of the current hot blast furnace waste gas burning is predicted through the waste gas temperature rise, the historical equipment peak valley value of the standard hot blast furnace found in the second step, the residual furnace burning time and the like in the middle period of the furnace burning, the furnace burning state of the standard hot blast furnace is single burning or double burning, the furnace burning time length of the current hot blast furnace is calculated according to the target value, and the furnace burning intensity of the current hot blast furnace is corrected under the condition that air and coal gas have adjusting allowance.
The fourth step: and at the end of burning the furnace, (the exhaust gas temperature of the current hot blast stove is burnt to the exhaust gas temperature set lower limit), judging whether the furnace needs to be burnt for a while (the adjustable value of the exhaust gas is 380-395 ℃) according to the current burning state of the standard hot blast stove (single burning or double burning), and if the furnace cannot be staggered, carrying out correct burning time shift for the next furnace due to the fact that the hot blast stove selected as the standard is a regular burning furnace.
The fifth step: and circularly detecting communication and executing the previous steps in sequence.
The invention relates to a coordinated furnace changing method for a gas pipe network of a blast furnace hot blast stove, which adopts the technical scheme, effectively predicts the running state of the hot blast stove by formulating a reasonable peak-staggering furnace changing system and checking and evaluating indexes, and performs automatic combustion optimization control on the hot blast stove through a designed control strategy. The method effectively realizes the peak shifting and furnace changing of the hot blast stove, reduces the pressure fluctuation of the gas pipe network under the condition of ensuring the heat storage of the hot blast stove and the air temperature of the air supply, and lays a foundation for the balance control of the gas pipe network.
Drawings
Taking the example of the coordination of changing the blast furnace with 3 blast furnaces and 10 hot blast furnaces, two one-burning two-feeding blast furnace hot blast furnaces are taken as the coordination hot blast furnace, and one two-burning two-feeding blast furnace hot blast furnace is taken as the standard hot blast furnace, and the invention includes but is not limited to this type.
FIG. 1: a hot blast stove coordinated furnace changing system block diagram;
FIG. 2: and a hot blast stove coordinated furnace change decision logic block diagram.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Taking a certain blast furnace hot blast stove site as an example, 3# is a 3200m double-burning double-delivery blast furnace hot blast stove, 1# and 2# are 1880m double-burning double-delivery blast furnace hot blast stoves, wherein the burning time of the 3# blast furnace hot blast stove is fixed to be about 90 minutes, the furnace changing time (single burning time) is about 30 minutes, the air supply time is about 120 minutes, the 1# and 2# blast furnace hot blast stoves burn at the reference waste gas temperature, the waste gas burns to 375 ℃ to 395 ℃ for furnace changing, the basic burning time is 55 minutes to 65 minutes, and the furnace changing time (double burning time) is 1 minute to 15 minutes due to the burning mode of one burning, one stewing and one delivery.
From the basic information of 3 blast furnace hot blast stoves, it can be known that the 3# blast furnace hot blast stove is a double-burning double-feeding system, the middle stamping and pressure equalizing process time is fixed, the stove burning time is relatively fixed, the stove changing period is longer, 4 hot blast stoves are relatively complex, and the adjustable space of the 1# and 2# blast furnace hot blast stoves is larger, so the 3# blast furnace hot blast stove is selected as a standard stove, and the 1# and 2# blast furnace hot blast stoves are selected as a coordinating stove.
Establishing 3 blast furnace hot blast stove communication, collecting information of each hot blast stove in an optical fiber mode, isolating through a physical firewall, judging whether the communication is normal or not through heartbeat signals collected by each blast furnace hot blast stove, and clicking a coordinated furnace changing method for commissioning on each hot blast stove system if the communication is normal.
And acquiring basic information such as the state of the standard furnace hot blast stove, the residual furnace burning time, the furnace changing time and the like, the state of the coordinated furnace hot blast stove, the actual waste gas temperature, the set waste gas temperature, the waste gas temperature rise and the like to a database. And calculating the equipment constant and the actual number of the on-grid equipment of the 3 blast furnace hot blast stoves, and judging whether the number of the coal gas equipment used by the pipe network at the moment meets the design expectation or not.
And adjusting in the middle stage of furnace burning, namely calculating whether the furnace burning time length of the current coordination furnace is prolonged or shortened according to the furnace burning conditions of the current coordination furnace and the standard furnace, and further correcting the furnace burning strength of the current hot blast furnace under the condition that air and gas have adjustment allowance.
Wherein the content of the first and second substances,
in order to adjust the furnace burning time in the middle period,
in order to coordinate the current exhaust gas temperature of the furnace,
in order to coordinate the temperature rise of the waste gas of the furnace,
in order to coordinate the set off-gas temperature of the furnace,
in order to coordinate the current air valve position of the furnace,
for coordinating the current gas of the furnaceThe valve position is set by the valve position,
respectively an adjustable upper limit and an adjustable lower limit (the initial value is 5 to 5) for the furnace burning time of the coordinated furnace.
In the state of a standard furnace (single firing or double firing),
the residual furnace burning time of the standard furnace which is fast to the furnace,
the time for each furnace change of the standard furnace.
And (4) judging the furnace changing time of the coordinating furnace according to the furnace burning conditions of other coordinating furnaces and the standard furnace at the last stage of the furnace burning (when the exhaust gas temperature of the coordinating hot blast furnace is burnt to the exhaust gas temperature set lower limit value).
Wherein the content of the first and second substances,
counting down for the last stage of furnace burning according to the current waste gas temperature of the coordinated furnace
And upper limit of exhaust gas temperature
Slope of temperature rise
Calculating the maximum adjustable time, and considering the state of the standard furnace and the ideal time for changing the furnace of the coordinating furnace
And the state of other furnaces, to obtain the present coordinated furnaceAnd (4) counting down when the furnace is changed, continuously executing the operation in the last stage of the furnace burning, and prompting the furnace changing operation after the counting down is finished.
By the steps, the time for changing the blast furnace hot blast stove of 3 blast furnaces of a certain steel mill is coordinated and controlled in real time, and the aim of shifting the hot blast stove in a peak position is fulfilled and the fluctuation of the pressure of a gas pipe network is effectively reduced by verifying the actual application and ensuring that the stove burning and air supply are advanced.
Claims (5)
1. A coordinated furnace changing method for a blast furnace hot blast stove gas pipe network is characterized by comprising the following steps: (1) communication detection, namely detecting whether heartbeat data transmitted from the single hot blast stove is normal or not, executing the next step if the heartbeat data is normal, wherein in the communication monitoring process, the communication abnormality phenomenon of any blast furnace hot blast stove is regarded as communication abnormality, and jumping out of circulation; (2) data acquisition, basic data calculation and pretreatment: reading basic data information of each blast furnace hot blast stove to a database, wherein the basic data information comprises vault crown temperature, actual waste gas temperature, set waste gas temperature, hot blast stove state, stove burning time, air supply state, waste gas temperature rise and the like, calculating current equipment constants, the number of blast furnace hot blast stove equipment actually on the network, making a decision to judge whether the number of coal gas equipment used by the pipe network at the moment meets design expectations or not, and further guiding the next operation; (3) adjusting the middle period, namely burning the hot blast stove in the early period according to the normal burning rhythm, predicting whether the waste gas of the current hot blast stove burns to a target value by the waste gas temperature rise, the peak valley value of the historical equipment of the standard hot blast stove found in the second step, the residual burning time and the like in the middle period of burning, and calculating whether the burning time length of the current hot blast stove is prolonged or shortened according to the single burning state or the double burning state of the standard hot blast stove, and further correcting the burning intensity of the current hot blast stove under the condition that air and coal gas have adjusting allowance; (4) at the end of burning, judging whether the furnace needs to be burned for a while (the adjustable value of the waste gas is 380-395 ℃) according to the current burning state (single burning or double burning) of the standard hot blast furnace (the waste gas temperature of the current hot blast furnace is burned to the lower limit value), and if the furnace cannot be staggered, carrying out correct burning time shift for the next furnace in a staggered manner due to the fact that the hot blast furnace selected as the standard is a regular burning furnace; (5) and circularly detecting communication and executing the previous steps in sequence.
2. The method according to claim 1, wherein in the step (3), after the middle period of each furnace burning, the final state is evaluated according to the current state of each blast furnace hot blast furnace, the temperature of the exhaust gas, the temperature rise of the exhaust gas, the position of an air valve, the position of a gas valve, and the like.
3. The method of claim 1, wherein in the step (3), the state of the last stage is evaluated in the middle stage of furnace burning, and the furnace burning intensity is changed in advance according to the predicted different furnace changing conditions of the last stage and considering the opening degree of air and gas valves.
4. The method of claim 1, wherein in the step (4), the maximum adjustable time is estimated according to the current exhaust gas temperature, the exhaust gas temperature rise, the valve position, the upper limit of the exhaust gas temperature and the like of each hot blast stove at the end of the burning.
5. The method of claim 1, wherein in step (4), at the end of the furnace-burning period, an ideal time for the furnace-changing is planned according to the furnace-burning state of each blast furnace, and the time for the furnace-changing is accurately controlled by counting down the time for the furnace-changing and giving a voice prompt in consideration of the maximum adjustable time.
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Cited By (3)
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| CN112215464A (en) * | 2020-09-04 | 2021-01-12 | 北京天泽智云科技有限公司 | Prediction balance scheduling system for blast furnace gas under multiple working conditions |
| CN112593032A (en) * | 2020-12-11 | 2021-04-02 | 安徽工业大学 | Key parameter processing method for blast furnace heat exchange air furnace |
| CN114265313A (en) * | 2021-12-23 | 2022-04-01 | 河钢数字信达(邯郸)科技有限公司 | Air valve adjusting and optimizing strategy method based on waste gas temperature rising curve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112215464A (en) * | 2020-09-04 | 2021-01-12 | 北京天泽智云科技有限公司 | Prediction balance scheduling system for blast furnace gas under multiple working conditions |
| CN112215464B (en) * | 2020-09-04 | 2024-05-07 | 北京天泽智云科技有限公司 | Blast furnace gas's prediction balanced scheduling system under multiplex condition |
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| CN114265313A (en) * | 2021-12-23 | 2022-04-01 | 河钢数字信达(邯郸)科技有限公司 | Air valve adjusting and optimizing strategy method based on waste gas temperature rising curve |
| CN114265313B (en) * | 2021-12-23 | 2024-02-13 | 河钢数字信达(邯郸)科技有限公司 | Air valve optimization strategy method based on exhaust gas temperature rising curve |
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